A well wash valve

Abstract

The utility model discloses a kind of well washing valves, including bridge type body, the bridge type body sets up upper end face and sets up blind hole, the bridge type body sets up upper end face and sets up the axial passage communicated with lower end face, the lateral passage of blind hole communication is set to the lateral passage of bridge type body side wall in blind hole, the blind hole connects double-ball check valve, liquid can only flow from bridge type body outside to bridge type body upper by double-ball check valve.The utility model reduces the risk of well washing valve leakage at the same time, through spare measure, guarantee the positive sealing of separate injection pipe column, extend the effective period of well washing valve in well, the utility model is simple and easy to operate, sealing is reliable, and use cost is low.

Description

Technical Field

[0001] This utility model relates to the field of petroleum development technology, specifically a well-washing valve. Background Technology

[0002] A typical stratified water injection string generally includes a distributor, packer, bottom screen plug (well-washing valve, screen pipe, and plug), and other tools. The bottom screen plug, while ensuring a positive seal, also provides a channel for backwashing, making it a crucial component of the downhole injection string. In actual oilfield production, if a well-washing valve leaks, a large amount of injected water will flow out, leading to the failure of the entire injection string. The usual practice is to insert a tubing plug or perform a pipe inspection. Inserting a tubing plug still requires setting and other operations, and even after successful installation, backwashing is usually not possible, or the well-washing orifice diameter is too small and prone to clogging. Replacing the injection string results in economic losses in terms of manpower and resources; furthermore, it can affect the dynamic balance of the reservoir, leading to decreased production and increased water cut in the corresponding wells.

[0003] Publication No. CN205297410U discloses a well-washing valve, comprising: a hollow tube body, a plug, a valve ball, and a pin; an inlet is located on the wall of the hollow tube body; an inner wall of the hollow tube body extends from the inlet into the interior of the hollow tube body; the plug is located at the top of the inner wall; the plug is connected to the inner wall by a pin; and the valve ball is located at the top of the plug. The well-washing valve provided by this utility model is connected to the bottom of the injection tubing string and to a tailpipe plug. During well completion, pressure is applied to the injection tubing string to a certain level, the pin between the plug and the inner wall of the hollow tube body is sheared, the plug falls into the inner wall of the hollow tube body, and the valve ball falls onto the inner wall, forming a one-way valve function sealing tubing string.

[0004] The existing technology uses a single valve ball, which has a short service life.

[0005] Announcement No.: CN205089284U discloses a single-flow valve for sediment settling at the bottom of a water injection pipe column, including a sleeve, a single-flow valve assembly, a flow channel connector, an angled pipe, and a sediment settling tail pipe, which are connected to the bottom of the water injection pipe column. When sediment falls from the water injection pipe column, it sinks into the sediment settling tail pipe through the lower crescent-shaped channel and the upper crescent-shaped channel, and will not accumulate on the single-flow valve assembly. The axis of the angled pipe is not coaxial with the axis of the flow channel connector, and the two axes are 4-19m apart, so that the angled pipe is located on one side inside the flow channel connector, and the flow channels of the lower crescent-shaped channel and the upper crescent-shaped channel are more concentrated than when the angled pipe is in the center position.

[0006] The existing technology uses a single valve ball, which has a short service life.

[0007] Announcement No. CN114837583B discloses a well-washing tool and a water injection string, including a working barrel and a well-washing valve. The working barrel has a main channel, a side channel, a first inlet port, and a second inlet port. The first inlet port connects the outside of the working barrel to the main channel, and the second inlet port connects the main channel and the side channel. The first inlet port is located below the second inlet port. The well-washing valve has a hollow cavity, a third inlet port, and a fourth inlet port. Both the third and fourth inlet ports connect the outside of the well-washing valve to the hollow cavity. The third inlet port is located below the fourth inlet port, and the valve head of the well-washing valve is located between the third and fourth inlet ports.

[0008] The existing technology is complex, but it is essentially still a valve ball with a short service life.

[0009] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0010] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model provides a well washing valve.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A well-washing valve includes a bridge-type body, wherein the bridge-type body has a blind hole on its upper end face, and an axial channel on its upper end face communicating with its lower end face. The sidewall of the bridge-type body is provided with a lateral channel communicating with the blind hole. The blind hole is connected to a double-ball check valve, which allows liquid to flow only from the outside of the bridge-type body to the top of the bridge-type body.

[0013] Furthermore, the dual-ball check valve includes a ball cover, the ball cover is provided with a liquid passage hole, the lower inner wall of the ball cover is connected to a ball seat by a thread, and the lower inner wall of the ball seat is connected to a connecting body by a thread;

[0014] Specifically, the connector is tubular, and the outer wall of the lower end of the connector is threadedly connected to the inner wall of the blind hole of the bridge body;

[0015] Specifically, an inner convex ring is provided at the upper end of the inner wall of the ball seat, and a second valve ball is placed at the upper end of the inner convex ring;

[0016] Specifically, a third valve ball is placed at the upper end of the connector, and a spring is provided between the third valve ball and the inner convex ring.

[0017] Furthermore, the upper end of the inner wall of the inner convex ring of the ball seat is provided with a conical surface for sealing and engaging with the second valve ball, and the upper end of the inner wall of the connecting body is provided with a conical surface for sealing and engaging with the third valve ball.

[0018] Furthermore, a conical apex is provided at the upper end of the spherical cover, and the outer diameter of the spherical cover is projected through the upper port of the axial channel.

[0019] Furthermore, the side wall of the spherical cover is provided with liquid passage holes, which are elongated holes, and at least two liquid passage holes are provided, which are evenly distributed along the circumference of the spherical cover.

[0020] Furthermore, the lateral channels are radial through holes, and at least two lateral channels are provided and are evenly distributed along the circumference of the connector; at least two axial channels are provided and are evenly distributed along the circumference of the connector.

[0021] Furthermore, the lateral channels are arranged in at least two rows equidistantly along the axial direction of the connector and at least two columns evenly distributed along the circumference of the connector; the axial channels and the columns of lateral channels are alternately arranged.

[0022] Furthermore, the outer wall of the upper end of the bridge body is connected to the outer cylinder, and the upper end of the outer cylinder is connected to the upper connector; the outer wall of the lower end of the bridge body is connected to the lower connector; the lateral channel is disposed between the outer cylinder and the lower connector.

[0023] Furthermore, it also includes a ball valve for throwing balls;

[0024] Specifically, the ball valve includes a sealing claw, a sliding sleeve, and a first valve ball;

[0025] Specifically, the inner wall of the outer cylinder is provided with a connecting protrusion ring, the inner wall of the connecting protrusion ring is connected to the sliding sleeve by a shear pin, and the upper inner wall of the sliding sleeve is connected to the lower outer wall of the sealing claw.

[0026] Specifically, the inner wall of the outer cylinder is provided with an upward-facing conical expansion step, the upper end of the sealing claw is a split claw, and the outer diameter of the claw head of the split claw matches the large diameter inner wall above the conical expansion step of the outer cylinder;

[0027] Specifically, the outer wall of the sliding sleeve is provided with a concave ring, a retaining ring is placed inside the concave ring, and the connecting convex ring compresses the retaining ring;

[0028] Specifically, after the sliding sleeve and the first valve ball are pressed and moved downward, the claw head of the split claw is squeezed inward by the inner wall of the lower diameter below the expansion step, restricting the first valve ball from disengaging. The retaining ring pops out and cooperates with the inner wall of the lower end of the connecting protrusion to form a lower limit position, and the lower end face of the sealing claw and the upper end face of the connecting protrusion form an upper limit position.

[0029] Furthermore, a tapered surface is provided on the upper end of the inner wall of the sliding sleeve for sealing and mating with the first valve ball.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] 1. This utility model reduces the risk of well-washing valve leakage while ensuring positive sealing of the injection tubing string through backup measures, extending the in-well validity period of the well-washing valve. This utility model is simple to operate, has reliable sealing, and low operating costs.

[0032] 2. This utility model is equipped with a double ball valve to improve the reliability of positive sealing for different well inclinations.

[0033] 3. This utility model is equipped with a backup mechanism to reduce the risk of inspection and replacement. If the existing well-washing valve becomes blocked or leaks, a new sealing channel can be established by dropping a ball. Attached Figure Description

[0034] Figure 1 This is a structural schematic diagram of a well-washing valve according to this utility model.

[0035] In the diagram: 1—Upper connector; 2—Outer cylinder; 3—Sealing claw; 4—First valve ball; 5—Sliding sleeve; 6—Snap ring; 7—Ball cover; 8—Second valve ball; 9—Ball seat; 10—Spring; 11—Third valve ball; 12—Connecting body; 13—Bridge body; 13.1—Blind hole; 13.2—Axial channel; 13.3—Side channel; 14—Lower connector. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] Example 1:

[0038] Please see Figure 1 The present invention provides a well-washing valve, comprising a bridge body 13, wherein the bridge body 13 is provided with a blind hole 13.1 on its upper end face, and an axial channel 13.2 communicating with the lower end face on its upper end face. The sidewall of the bridge body 13 is provided with a lateral channel 13.3 communicating with the blind hole 13.1. The blind hole 13.1 is connected to a double-ball check valve, which allows liquid to flow only from the outside of the bridge body 13 to the top of the bridge body 13.

[0039] Specifically, the lateral channel 13.3 is a radial through hole, and at least two lateral channels 13.3 are provided and are evenly distributed along the circumference of the connector 12.

[0040] Specifically, the lateral channels 13.3 are arranged in at least two rows equidistantly along the axial direction of the connector 12 and in at least two columns evenly distributed along the circumference of the connector 12.

[0041] Specifically, the axial channel 13.2 is an axial through hole, and at least two axial channels 13.2 are provided and are evenly distributed along the circumference of the connector 12.

[0042] Specifically, the axial channel 13.2 and the row of lateral channels 13.3 are alternately arranged.

[0043] Among them, the axial channel 13.2 is a settling channel, where large particles can settle into the tailpipe, reducing the blockage of the water distributor nozzle and well washing valve caused by impurities in the injected water.

[0044] Furthermore, the double-ball check valve includes a ball cover 7, which has a liquid passage hole. The lower inner wall of the ball cover 7 is threadedly connected to a ball seat 9. The lower inner wall of the ball seat 9 is threadedly connected to a connector 12, which is tubular. The lower outer wall of the connector 12 is threadedly connected to the inner wall of the blind hole 13.1 of the bridge body 13. An inner convex ring is provided at the upper end of the inner wall of the ball seat 9. A second valve ball 8 is placed at the upper end of the inner convex ring. A third valve ball 11 is placed at the upper end of the connector 12. A spring 10 is provided between the third valve ball 11 and the inner convex ring.

[0045] Among them, the spring 10 enables the third valve ball 11 to reset more quickly when the backwashing well is stopped, balances the pressure on the second valve ball 8, and prevents the second valve ball 8 from being subjected to pressure and thus avoiding collision damage. After the third valve ball 11 fails, the second valve ball 8 performs a sealing function under pressure.

[0046] Specifically, the upper end of the inner wall of the inner convex ring of the ball seat 9 is provided with a conical surface for sealing and cooperating with the second valve ball 8, and the upper end of the inner wall of the connecting body 12 is provided with a conical surface for sealing and cooperating with the third valve ball 11.

[0047] Specifically, the upper end of the spherical cover 7 is provided with a conical top, and the outer diameter of the spherical cover 7 is projected through the upper port of the axial channel 13.2, so that the deposits fall directly into the axial channel 13.2 under the guidance of the conical top and enter the tailpipe for deposition.

[0048] Specifically, the side wall of the spherical cover 7 is provided with liquid passage holes, which are elongated holes. At least two liquid passage holes are provided and are evenly distributed along the circumference of the spherical cover 7.

[0049] Furthermore, the outer cylinder 2 is threadedly connected to the upper outer wall of the bridge body 13, and the upper end of the outer cylinder 2 is threadedly connected to the upper connector 1; the lower connector 14 is threadedly connected to the lower outer wall of the bridge body 13.

[0050] Specifically, the lateral channel 13.3 is located between the outer cylinder 2 and the lower connector 14.

[0051] Specifically, the thread in this embodiment is a sealing pipe thread, which has good sealing performance and is further sealed by a sealing ring.

[0052] Downhole: Connect the tool string directly and lower it in according to design requirements;

[0053] During water injection: During normal water injection, the tailpipe plug, the second valve ball 8, the third valve ball 11 and their respective ball seats maintain a positive seal, and the sediment in the tubing falls into the tailpipe through the axial channel 13.2.

[0054] During backwashing: Well-washing fluid is injected through the annulus of the casing and tubing. The well-washing fluid opens the third valve ball 11 and the second valve ball 8 through the lateral channel 13.3 and blind hole 13.1, thus achieving backwashing.

[0055] Example 2:

[0056] Based on Example 1, in this example, a ball valve is provided above the double-ball check valve on the inner wall of the outer cylinder 2, which is used to re-establish the backwash valve structure after the double-ball check valve fails.

[0057] The ball valve includes a sealing claw 3 and a sliding sleeve 5. A connecting protrusion ring is provided on the inner wall of the outer cylinder 2. The inner wall of the connecting protrusion ring is connected to the sliding sleeve 5 by a shear pin. The upper inner wall of the sliding sleeve 5 is connected to the lower outer wall of the sealing claw 3 by a thread. The inner wall of the outer cylinder 2 is provided with an upward-facing tapered expansion step. The upper end of the sealing claw 3 is a split claw. The outer diameter of the claw head of the split claw matches the large diameter inner wall above the tapered expansion step of the outer cylinder 2. A concave ring is provided on the outer wall of the sliding sleeve 5. A retaining ring 6 is placed in the concave ring. The connecting protrusion ring compresses the retaining ring 6. After the sliding sleeve 5 is pressed down by the first valve ball 4, the claw head of the split claw is squeezed inward by the lower diameter inner wall below the expansion step. The retaining ring 6 pops out and matches the lower inner wall of the connecting protrusion ring to form a lower limit position. The lower end face of the sealing claw 3 and the upper end face of the connecting protrusion ring form an upper limit position.

[0058] Specifically, the upper end of the inner wall of the sliding sleeve 5 is provided with a conical surface for sealing and cooperating with the first valve ball 4.

[0059] When the well-washing valve malfunctions: When the second valve ball 8 and the third valve ball 11 fail to maintain a seal with their respective seats, the injected water enters the casing through the blind hole 13.1 and the lateral channel 13.3 on the bridge body 13, causing the forward seal to fail; the first valve ball 4 is inserted from the wellhead into the sliding sleeve 5, and under a certain hydraulic pressure, the shear pin is cut off, causing the sealing claw 3 to move down together to the upper end face of the connecting convex ring for a limit, thereby locking the first valve ball 4. At the same time, the retaining ring 6 restricts upward movement, re-establishing the valve seat mechanism of the first valve ball 4 and the sliding sleeve 5, achieving a forward seal and reverse well washing.

[0060] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0061] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0062] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0063] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A well-washing valve, comprising a bridge-type body, wherein the bridge-type body has a blind hole on its upper end face, an axial channel communicating with its lower end face on its upper end face, and a sidewall of the bridge-type body connected to the lateral channel of the blind hole, characterized in that, The blind hole is connected to a double-ball check valve, which allows liquid to flow only from the outside of the bridge body to the top of the bridge body.

2. The well-washing valve according to claim 1, characterized in that, The dual-ball check valve includes a ball cover, the ball cover is provided with a liquid passage hole, the lower inner wall of the ball cover is connected to a ball seat by a thread, and the lower inner wall of the ball seat is connected to a connecting body by a thread; The connector is tubular, and the lower outer wall of the connector is threadedly connected to the inner wall of the blind hole of the bridge body. An inner convex ring is provided at the upper end of the inner wall of the ball seat, and a second valve ball is placed at the upper end of the inner convex ring; A third valve ball is placed at the upper end of the connector, and a spring is provided between the third valve ball and the inner convex ring.

3. A well-washing valve according to claim 2, characterized in that, The upper end of the inner wall of the ball seat's inner convex ring is provided with a conical surface for sealing and engaging with the second valve ball, and the upper end of the inner wall of the connecting body is provided with a conical surface for sealing and engaging with the third valve ball.

4. A well-washing valve according to claim 2, characterized in that, The upper end of the spherical cover is provided with a conical apex, and the outer diameter of the spherical cover is projected through the upper port of the axial channel.

5. A well-washing valve according to claim 2, characterized in that, The side wall of the spherical cover is provided with liquid passage holes, which are elongated holes. At least two liquid passage holes are provided and are evenly distributed along the circumference of the spherical cover.

6. A well-washing valve according to claim 1, characterized in that, The lateral channels are radial through holes, and at least two lateral channels are provided and are evenly distributed along the circumference of the connector; at least two axial channels are provided and are evenly distributed along the circumference of the connector.

7. A well-washing valve according to claim 6, characterized in that, The lateral channels are arranged in at least two rows at equal intervals along the axial direction of the connector and at least two columns evenly distributed along the circumference of the connector; the axial channels and the columns of lateral channels are alternately arranged.

8. A well-washing valve according to claim 1, characterized in that, The upper outer wall of the bridge-type body is connected to the outer cylinder, and the upper end of the outer cylinder is connected to the upper connector; the lower outer wall of the bridge-type body is connected to the lower connector; the lateral channel is disposed between the outer cylinder and the lower connector.

9. A well-washing valve according to claim 8, characterized in that, It also includes the ball valve for throwing; The ball valve includes a sealing claw, a sliding sleeve, and a first valve ball; The inner wall of the outer cylinder is provided with a connecting protrusion ring, and the inner wall of the connecting protrusion ring is connected to the sliding sleeve by a shear pin. The upper inner wall of the sliding sleeve is connected to the lower outer wall of the sealing claw. The inner wall of the outer cylinder is provided with an upward-facing conical expansion step, and the upper end of the sealing claw is a split claw. The outer diameter of the claw head of the split claw matches the large diameter inner wall above the conical expansion step of the outer cylinder. The outer wall of the sliding sleeve is provided with a concave ring, and a retaining ring is placed inside the concave ring. The connecting convex ring compresses the retaining ring. After the sliding sleeve and the first valve ball are pressed and moved downward, the claw head of the split claw is squeezed inward by the inner wall of the lower diameter below the expansion step, which restricts the first valve ball from disengaging. The retaining ring pops out and cooperates with the inner wall of the lower end of the connecting protrusion to form a lower limit position, and the lower end face of the sealing claw and the upper end face of the connecting protrusion form an upper limit position.

10. A well-washing valve according to claim 9, characterized in that, The upper end of the inner wall of the sliding sleeve is provided with a conical surface for sealing and mating with the first valve ball.

Images